Clamping mechanism



H` C. lOHANSEN.

CLAMPING MECHANISM.

APPLICATION man Nov. 13, 191B.

Iv/niew/ar:

Harry Johawsfm by UNITED STATES PATENT OFFICE.

HARRY C. JOHANSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO SULLIVAN MACHINERYCOMPANY, CORPORATION 0F MASSACHUSETTS.

CLAMPING MECI-IAN ISM.

e it known that I, HARRY C. JoHANsEN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Clamping Mechanism, ofwhich the following is a full, clear, and exact specification.

rihis invention relates to clamping mechanism, and more particularly toa clamping mechanism such as is commonly used on drill Sharpeners forholding the work (for example, a drill steel) during the upsettingoperation.

The object of the present invention is Yto provide an improved clampoperating means and one in which the clamping movement of the elementsthereof does not force some of these elements into a frictionalengagement which will cause the mechanism to operate slowly and jerkilyand which will absorb a great part of the available power for Voperatingthe clamp. `A further object of the invention is to provide an improvedmechanical connection between the driving and driven elements of theclamping mechanism, whereby the movement of a part of these elementsdoes not tend to force other of the elements out' of their properalinement, and so avoids the multiplication of the stresses which tendto bend or break the elements, and permits the use of a lighter, morerapidly acting machine. These and other objects and advantages of myimprovement will, however, hereinafter more fully appear.

In the accompanyingT drawings I have shown for purposes of illustrationone form which my tice.

In these drawings,- y

Figure 1 is a side elevation of a drill Sharpener provided with myimproved clamping mechanism, a part thereof being broken away to showthe clamp operating means.

Fig. 2 is a sectional view of the clamp operating means taken `on theline 2-2 of Fig. 1.

Fig. 3 is a Sectional view on the line 3-3 of Fig. 1 with portions ofthe clamp actuating means shown in elevation for clearness.

Specieation of Letters Patent.

invention may assume in prac- Patented Dec. 6, 1921.

ig. l is a side elevation of the toggle joint shown .in Fig. l, theseparts being in different positions.

In this illustrative construction I have vshown a drill Sharpener lhaving a vertically disposed swaging hammer 2 adapted to operate theupper of two swaging dies 3, the iuid pressure for operating thisharnmer being supplied from the main supply pipe 4: by a pipe (notshown) which may pass through the base of the Sharpener or around it.The dow of pressure fluid to the swaging hammer 2 is controlled by afooiJ lever 5 which operates a valve in the pipe line, above mentioned,the valve and pipe line in the preferred construction being placedwithin the base of the drill sharpener, the latter being supplied with aremovable plate 6 to facilitate the installation and inspection of theseand other parts that will .hereinafter be described.

pneumatic pinning' tool and tool operating mechanism 7 is mounted on thesharpener on or about the level of the swaging dies, the fluid pressurefor operating this tool being supplied'through pipes 8 and 9. No leveror valve means are shown for controlling the operation of thisy pinningtool, the tool being setV in operation by pressing the work against itand being stopped by the withdrawal of the work therefrom.

A horizontal pneumatic hammer 10 operates a dolly 10 to upset the end ofa drill steel which is held between two clamping jaws 11 and 12. A pipe13 supplies pressure Huid to this hammer, and an exhaust pipe 14conducts the exhaust therefrom to the working parts of the clampingmechanism, the upsetting mechanism` and the swaging mechanism, tolubricate these parts and keep them free from dust or scale. The exhaustfrom the swaging hammer may be added to that of the upsetting hammer toincrease this lubricating and cleaning action. A single lubricator 15supplies lubricant to all the working parts, the lubricant being fedslowly'to the pressure .fluid and carried by the latter to all parts ofthe apparatus. A single lever 16 controls the upsetting hammer and theclamping device Y(to be hereinafter described) in such a manner`that'the clamping device is always operated to .grip the steel beforethe upsetting hammer is set in operation. As the parts so far describedlorm no part of the present invention, fur* ther description of theseparts or their operation is thought unnecessary.

The upper clamping jaw 11 is mounted in a yoke carried on the upper endof two parallel standards 17, the latter being so mounted in the trameof the drill Sharpener that they have a limited reciprocating movementtherein. A The lower ends of these standards are fixedly mounted inspaced relation in a second yoke 18. Two oppositely disposed bearings 19and 20are respectively mounted on the drill Sharpener frame and theupper face of the yoke 18 in such a manner that they receive the thrustof a toggle joint mechanism comprisingtwo 'links 21, 22 pivotallyconnected to the frame and yoke 18 at points adjacent the two bearingsmounted thereon, and pivotally connected to each other by a pin 23passing through the overlapping ends of these links and two y guideblocks 24.

` may be providedin the valve box disposed pistons cylinder heads used,the

Coperating with the toggle mechanism just described, and adapted to movein a d1- rection substantially at right angles to theV direction ofmovement of the standards,is a plunger 25 provided with two oppositely26, 27, the latter carrying piston heads 28, 29 having differentialareas. These pistons reciprocate in two oppositely disposed cylinders30, 81, the larger cyhnder being supplied with pressure fluid through apipe 32, a valve box 33, and a port 34, while the `smaller cylinder isalways supplied with pressure fluid under initial pressure through apipe 35 and port 36. By this construction it will be noted that themovement of the plunger is governedby the pressure of the lluidadmittedto the cylinder 30 and that a simple valve member 38 and operatedby asuitable connection with the lever 1G to admit fluid pressure to but oneend of one cylinder 'and to exhaust the fluid therefrom. In order thatthe fluid flow to the hammer 9 may be properly timed with the flowA tothe cylinder 30 so vthat the clamping mechanism is always set on theduring the upsetting operation, the connected tothe valve lbox 33, and

work pipe 13 is the flow through this pipe is governed pref- In the formof my improvement shown herein, it will be noted thatbyjtheuse of thecylinder 31 the valve operating mechanism` can be n for releasing thejaws from thejwork` has been reduced because the plunger will move tothe left as soon as the exhaust from the cylinder 30 has been opened,and, further, that because of the'sizes jof the dilerential forcetending to simplified, the time necessary `I move the toggle to a setposition (Fig. 1) is amply sufficient for the purpose.

The plunger 25 is provided with two Vvertical slots 37, 38 at rightangles to each other, the first extending clear throughthe plunger toreceive the links 21, 22, and the second extending parallel to thestandards 17 for but a part of the depth oi1 the plunger and beingadapted to receive the guide blocks 24 between parallel guiding faces24C. It will noted that by this improved means for connecting theplunger and tog gle mechanism, as the plunger moves to the right or leftthe blocks will slide in the slots 38 and bear against the guiding faces2li on the plunger. in such a manner that yneither the relative movementof the two links, of the links and plunger, or of the Vpistons in theircylinders,y tends to produce a `frictional engagement which willmaterially affect the operation. Attention is also directed to the factthat there are but few moving parts, that these are made strong andsubstantial, and that all or" the parts are easily accessible upon theremoval ofthe plate 6:

It will be noted vrom Figs. 1 and 1 that whenthe clampV is in releaseposition the axis of the pin 23 is disposed above the axis of thepistons-26 and 27 and that as the clamp is moved toward clampingposition, the axis of the pin moves downward until it lies in the samehorizontal plane asthe axis of the pistons at the moment when the parts.reach `the position of Fig. 1. llhe desira- `member inserted intheclamp securely,

there is no force `present havingl a compo nent in such direction `as tocause binding of the pistons 26 and 27 on the walls oij their cylinders.Accordingly, my l mechanism moves verysmoothly and without waste `ofpower due to excessive Jfriction of the clamp actuating mechanism initsguides;

While I have herein shown and described for the purpose of illustrationone specific form of the invention, it is to be understood that the sameis chosen for illustrative purposes only and that extensivel deviationsmay be made from the disclosed form thereof without departing from thespirit of the invention orV the scope of the appended claims.

What I claim is new and desire to secure by VLetters Patent is :A y ,y

1.7In combination, a frame, work clamping mechanism thereon including atoggle link, a link actuating member, and a connection between said linkand said member slidable in ardirection transverse to the directionofmovernent'oi the member. y

2. In combination, aV frame, work clamping means thereon, an actuatingmember, and mechanical connecting means between said clamping vmeans andmember, said connecting means havinga movement of translation withrespect to said member.

3. In combination, a frame, work clamping mechanism thereon including atoggle link, a link actuating member, and a sliding connection Vbetweensaid link and said member.

4. In combination, frame, work clamping means thereon, an actuatingmember, and mechanical connecting means between said clamping means andmember, said connecting means having a sliding connection with saidmember. l

5. In combination, a frame, work clamping means thereon, an actuatingniemeer having a slot therein, and mechanical connecting means betweensaid clamping means and actuating member and including an elementslidable in said slot.

6. In combination, a frame, workl clamping means thereonV mounted formovement in a. given plane, an actuating member` a slot formedtherein'substantially parallel to said plane, and mechanical connectingmeans between said clamping means and actuating member and including anelement slidable in said slot.

7. In combination, a frame, work clamping mechanism thereon, operatingmeans for the latter, and an actuating plunger for said operating meanshaving a plurality of oppositely disposed differential piston heads anda connection with said operating means between said heads.

8. In combination, a frame, work clamping mechanism thereon, operatingmeans for the latter, differential cylinders mounted on said frame, andan actuating plunger for operating said mechanism, said plunger having aplurality of oppositely disposed differential pistons mounted in saidcylinders, there being a sliding connection between said operating meansand said plunger at a point between the heads of the latter. y

9. In combination, a frame, work clamping mechanism thereon, operatingmeans vfor the latter, and piston mechanism for actuating said clampingmechanism, said piston mechanism including a plurality of oppositelydisposed differential piston heads and being provided with a slotbetween said heads, said operating means having a sliding connectionwith said slot.

10. In combination, a frame, work clamping mechanism thereon, operatingmeans for the latter. a block secured to said operating means,differential cylinders mounted on said frame and an actuating plungerfor said operating means having a plurality of oppositely disposeddifferential pistons mounted inI said cylinders and provided with aslide for the guiding of said block.

11. In combination, a frame, work clamping means thereon, a plungertherefor comprising differential piston heads, and mechanical connectingmeans between said work clamping means and said lplunger .between itsheads.

12. In combination, a frame, work clamping means thereon, a plungertherefor comprising differential piston hea-ds, mechanical connectingmeanstherebetween, and a mechanical connection including a toggle linkbetween said connecting means and said clamping means. i

13. In combination, va frame, work clampino means thereon, a plungertherefor comprising differential piston heads, mechani-V cal connectingmeans therebetween, and a mechanical connection including a plurality oftoggle links between said connecting means and said clamping means.

14. In. combination, a frame, work clamping means thereon, an actuatingmember, a

mechanical connection between said actuat-V ing member and said'workclamping means comprising a pivot point on which force is `applied toeffect clamping movement of said work clamping means, said pivotpoint'moving toward the axis of said actuating member during clampingoperation. Y

15. In combination,a frame, work clamping mechanism thereon, anactuating member therefor, guiding means on the frame for said actuatingmember, and means including a connection between said work clampingmeans and said actuating member acting to decrease the pressure of saidactuating member on said guiding means upon progressive movement of saidactuating means toward clamping position.

16. In combination, a frame, work clamping mechanism thereon, operatingmeans therefor, an actuating member for said operating means, the pointof application of force of said actuating member to said operating meansbeing initially spaced from the axis of said actuating member andapproaching the same as the parts move toward clamping position.

17. In combination, a frame, work clamping mechanism thereon including atoggle link, a link actuating member, and a connection between saidtoggle link and link actuating member having provision whereby when thetoggle is broken force applied to said actuating member reacts along theline of the aXis of movement of said actuating member and also has acomponent tending to cause turning movement of said actuating member,said movement of said actuating member to straight line position of thetoggle link tending to eliminate the turning moment. l'

v said operating means 18. In combination, aframe, work clampingmechanism thereon comprising a movable jaw, operating means for saidmovable jaw adapted to move the same in opposite directions, and anactuating plunger for having a plurality of oppositely disposeddifferential pistons reciprocable in a line at right angles to the lineof movement of said movable jaw and a connection with saidoperatingmeans between said pistons.

19. In combination, a jaw thereon, a movable jaw adapted to cooperatetherewith, means for movin said jaw toward and away from said stationaryjaw comprising a guiding yoke spaced from the movable jaw, parallelstandards connecting the movable jaw and yoke, toggle mechanismcomprising links pivotally` connected to said yoke and frame and to eachi other, alined cylinders disposed on opposite sides of the plane ofsaid standards, pistons tting saidcylinders and having a connectinmember adapted to reciprocate between said standards, and operativeconnections between said connecting member and said toggle mechanism. i

20. In combination, a frame, work clamping mechanism thereon comprisinga staframe, a stationary tionary clamp jaw, a movablepclamp jaw, aguiding yoke spaced from said movable jaw, parallel standards connectingsaidlmovable jaw and yoke, operating means for said movable jawVcomprising alined` cylinders disposed on opposite sides of the saidstandards, pistons fitting said cylinders and having a connecting memberreciprocable between said standards, and means pivotally connected 4tosaid guiding yoke and operatively engaged by said connecting member foroperating said movable jaw.

'21, In combination, a'frame,iwork clamping mechanism thereon comprisinga movable jaw, and operating means yfor said movable jaw adapted to movethe same `in opposite directions including an actuating plunger for saidmovable jaw having a plurality of oppositely disposed pistons and anoperative connection with said jaw between said pistons, cylinders inwhich said pistons are reciprocable, and means for supplying pressurefluid to the smaller of said pistons constantly and to the largerthereof intermittently at the will of the operator.`

In testimony whereof` I aliix my' signature. Y l

VHARRY o. JonANsEN plane oi,

